Author: Sereno, N.
Paper Title Page
MO2C03 Coupled Bunch Mode Zero Correction within the Orbit Feedback Bandwidth 7
 
  • P.S. Kallakuri, A.R. Brill, J. Carwardine, L. Emery, N. Sereno
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
The fast orbit feed­back (FOFB) band­width for Ad­vanced pho­ton source up­grade (APS-U) will be DC-1 kHz and the syn­chro­tron fre­quency will be be­tween 100-560 Hz. This fre­quency over­lap places cou­pled bunch mode 0 (CBM0) in­duced hor­i­zon­tal orbit mo­tion in­side the orbit feed­back band­width, po­ten­tially af­fect­ing our abil­ity to achieve beam sta­bil­ity goals. Lon­gi­tu­di­nal feed­back kicker is not strong enough to damp CBM0 os­cil­la­tions. We de­vel­oped new beam-based feed­back method to sup­press CBM0 os­cil­la­tions with low level RF phase as ac­tu­a­tor. It uses ex­is­tent FOFB frame­work with no changes to the feed­back al­go­rithm. Ef­fec­tive­ness of this method is ver­i­fied using pre­sent APS op­er­a­tions lat­tice where syn­chro­tron fre­quency is out­side orbit feed­back band­width*. In the pre­sent work, low alpha lat­tice is cre­ated to em­u­late APS-U set­ting where syn­chro­tron fre­quency is in­side the orbit feed­back band­width. Ex­per­i­ments with this lat­tice suc­cess­fully demon­strated CBM0 cor­rec­tion within FOFB band­width. Com­bined op­er­a­tion of orbit feed­back and CBM0 cor­rec­tion is sta­ble, and CBM0 os­cil­la­tions are damped. We achieved bet­ter orbit mo­tion sup­pres­sion and cor­rec­tor drive ef­forts are re­duced as well.
* P. Kallakuri et al., ’Coupled bunch mode zero correction using orbit measurements and RF system phase feedback’, doi:10.1103/PhysRevAccelBeams.25.082801
 
slides icon Slides MO2C03 [1.326 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO2C03  
About • Received ※ 14 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 25 September 2023
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TUP027 Microbunching of Thermionic Cathode RF Gun Beams in the Advanced Photon Source S-Band Linac 240
 
  • J.C. Dooling, A.R. Brill, N. Kuklev, I. Lobach, A.H. Lumpkin, N. Sereno, Y. Sun
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by the U.S. D.O.E.,Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02- 06CH11357.
We re­port on mea­sure­ments of beams from thermionic cath­ode (TC) rf guns in the Ad­vanced Pho­ton Source S-Band Linac. These mea­sure­ments in­clude the macropulse out of both new and ex­ist­ing TC guns as well as the ob­ser­va­tion of mi­crobunch­ing within the mi­cropulses of these beams. A gun chop­per lim­its the macropulse FWHM du­ra­tion to the 10-ns range. Our ob­jec­tives were to analyse the new TC gun and in­ves­ti­gate mi­crobunch­ing within a TC-rf-gun-gen­er­ated beam. Our di­ag­nos­tics elu­ci­dated lon­gi­tu­di­nal beam struc­tures from the ns to the fs time scales. Co­her­ent tran­si­tion ra­di­a­tion (CTR) in­ter­fer­om­e­ters re­spond­ing to far-in­frared wave­lengths were em­ployed after each com­pres­sion stage to pro­vide the au­to­cor­re­la­tions of the sub-ps mi­cropulse du­ra­tions. The first com­pres­sion stage is an alpha mag­net and the sec­ond a chi­cane. A CCD cam­era was used to image the beam via op­ti­cal tran­si­tion ra­di­a­tion from an Al screen at the end of the linac and also em­ployed to mea­sure co­her­ent op­ti­cal tran­si­tion ra­di­a­tion (COTR) in the vis­i­ble range. The COTR di­ag­nos­tic ob­ser­va­tions, im­ply­ing mi­crobunch­ing on a fs time scale, are pre­sented and com­pared with a lon­gi­tu­di­nal space-charge im­ped­ance model.
 
poster icon Poster TUP027 [3.649 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP027  
About • Received ※ 15 July 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 23 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP028 Collimator Irradiation Studies at the Advanced Photon Source 245
 
  • J.C. Dooling, W. Berg, M. Borland, J.R. Calvey, L. Emery, A.M. Grannan, K.C. Harkay, Y. Lee, R.R. Lindberg, G. Navrotski, V. Sajaev, N. Sereno, J.B. Stevens, Y.P. Sun, K.P. Wootton
    ANL, Lemont, Illinois, USA
  • N.M. Cook
    RadiaSoft LLC, Boulder, Colorado, USA
  • D.W. Lee, S.M. Riedel
    UCSC, Santa Cruz, California, USA
 
  Funding: Work supported by the U.S. D.O.E.,Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02- 06CH11357.
We pre­sent re­sults from a re­cent col­li­ma­tor ir­ra­di­a­tion ex­per­i­ment con­ducted in the Ad­vanced Pho­ton Source (APS) stor­age ring. This ex­per­i­ment is the third in a se­ries of stud­ies to ex­am­ine the ef­fects of high-in­ten­sity elec­tron beams on po­ten­tial col­li­ma­tor ma­te­r­ial for the APS-Up­grade (APS-U). The in­tent here is to de­ter­mine if a fan-out kicker can suf­fi­ciently re­duce e-beam power den­sity to pro­tect hor­i­zon­tal col­li­ma­tors planned for the APS-U stor­age-ring. The fan-out kicker (FOK) spreads the bunched-beam ver­ti­cally al­low­ing it to grow in trans­verse di­men­sions prior to strik­ing the col­li­ma­tor. In the pre­sent ex­per­i­ment, one of the two col­li­ma­tor test pieces is fab­ri­cated from oxy­gen-free cop­per; the other from 6061-T6 alu­minum. As in past stud­ies, di­ag­nos­tics in­clude turn-by-turn BPMs, a di­ag­nos­tic image sys­tem, fast beam loss mon­i­tors, a pin-hole cam­era, and a cur­rent mon­i­tor. Post-ir­ra­di­a­tion analy­ses em­ploy mi­croscopy and met­al­lurgy. To avoid con­fu­sion from mul­ti­ple strikes, only three beam aborts are car­ried out on each of the col­li­ma­tor pieces; two with the FOK on and the other with it off. Ob­served hy­dro­dy­namic be­hav­ior will be com­pared with cou­pled codes.
 
poster icon Poster TUP028 [3.733 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP028  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 29 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP041 APS Upgrade Radiation Safety Beam Current Interlock 281
 
  • R.T. Keane, K.C. Harkay, N. Sereno
    ANL, Lemont, Illinois, USA
  • A. Caracappa, C. Danneil, K. Ha, J. Mead, D. Padrazo
    BNL, Upton, New York, USA
 
  Funding: Work supported by U. S. Department of Energy Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357
The Ad­vanced Pho­ton Source up­grade (APS-U) Multi-Bend Acro­mat (MBA) stor­age ring uti­lizes on-axis swap-out in­jec­tion re­quir­ing up to 20nC charge per elec­tron bunch. En­force­ment of ra­di­a­tion safety lim­its for the new stor­age ring will be ac­com­plished by a new beam charge mon­i­tor in­ter­lock that ac­cu­mu­lates beam charge mea­sure­ments in the Booster-to-Stor­age ring (BTS) trans­fer line and dis­ables in­jec­tion when the charge limit over a pre­set time pe­riod is ex­ceeded. The new in­ter­lock is based on the ex­ist­ing APS Beam Shut-Off Cur­rent Mon­i­tor (BE­SOCM), and in­cor­po­rates sig­nif­i­cant im­prove­ments over the ex­ist­ing sys­tem. New fea­tures in­clude use of di­rect dig­i­ti­za­tion and FPGA pro­cess­ing, ex­ten­sive re­mote mon­i­tor­ing ca­pa­bil­i­ties, ex­panded self-test and fail-safe func­tions, and the abil­ity to ad­just set­tings and mon­i­tor sta­tus re­motely via EPICS. The new de­vice in­te­grates a test pulse (self-check) fea­ture that ver­i­fies the in­tegrity of the in­te­grat­ing beam cur­rent trans­former (ICT) and cable sys­tem used to de­tect the beam sig­nal. This paper de­scribes the new BTS in­ter­lock (BE­SOCM) de­sign and pre­sents re­sults of bench test and in-ma­chine eval­u­a­tion of the pro­to­type and pro­duc­tion units.
 
poster icon Poster TUP041 [1.731 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP041  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 01 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEP015 Synchrotron Light Monitor for the Advanced Photon Source Booster Synchrotron 358
 
  • K.P. Wootton, W. Berg, W.P. Burns III, J.R. Calvey, J.C. Dooling, L. Erwin, A.H. Lumpkin, N. Sereno, S.E. Shoaf, S.G. Wang
    ANL, Lemont, Illinois, USA
 
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
A new syn­chro­tron light mon­i­tor has been tested for the booster syn­chro­tron of the Ad­vanced Pho­ton Source. Vis­i­ble light syn­chro­tron ra­di­a­tion is col­lected by a mir­ror on a path tan­gen­tial to the elec­tron beam orbit, and di­rected to an op­ti­cal imag­ing sys­tem and cam­era. This is planned to be a non-in­ter­cept­ing, trans­verse beam-size mon­i­tor even with the higher stored beam charges (~17 nC) needed for the Ad­vanced Pho­ton Source Up­grade. In the pre­sent work, we de­scribe the pre­sent syn­chro­tron ra­di­a­tion di­ag­nos­tic lay­out. An analy­sis of the syn­chro­tron ra­di­a­tion power on the mir­ror, the op­ti­cal lay­out with com­po­nents, and fea­tures of the con­trol sys­tem will be pre­sented.
 
poster icon Poster WEP015 [1.148 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP015  
About • Received ※ 09 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 02 October 2023
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WEP016 Beamline for Time Domain Photon Diagnostics at the Advanced Photon Source Upgrade 363
 
  • K.P. Wootton, W.X. Cheng, G. Decker, N. Sereno, F. Westferro
    ANL, Lemont, Illinois, USA
 
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Time do­main pho­ton di­ag­nos­tics are pro­posed for elec­tron beam char­ac­ter­i­sa­tion and op­er­a­tion of the Ad­vanced Pho­ton Source Up­grade stor­age ring. In the pre­sent work, we pre­sent up­dated sta­tus on the time-do­main X-ray and vis­i­ble pho­ton di­ag­nos­tic beam­line for the Ad­vanced Pho­ton Source Up­grade. We out­line de­sign in­flu­ences lead­ing to the pro­posed beam­line lay­out, in par­tic­u­lar long-term main­te­nance and com­mon­al­ity with other beam­lines at the Ad­vanced Pho­ton Source.
 
poster icon Poster WEP016 [0.812 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP016  
About • Received ※ 10 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
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WEP017 Electron Beam at the Advanced Photon Source Linac Extension Area Beamline 368
 
  • K.P. Wootton, W. Berg, M. Borland, A.R. Brill, J.M. Byrd, S. Chitra, J.T. Collins, J.C. Dooling, J.N. Edwards, L. Erwin, G.I. Fystro, T. Grabinski, M.J. Henry, E.E. Heyeck, J.E. Hoyt, R.T. Keane, S.H. Lee, J. Lenner, I. Lobach, A.H. Lumpkin, A. Puttkammer, V. Sajaev, N. Sereno, Y. Sun, J. Wang, S.G. Wang, A. Zholents
    ANL, Lemont, Illinois, USA
 
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
The Linac Ex­ten­sion Area has been de­vel­oped into a beam­line area for test­ing ac­cel­er­a­tor com­po­nents and tech­niques. Be­gin­ning com­mis­sion­ing ac­tiv­i­ties in Feb­ru­ary 2023, we have de­liv­ered the first elec­tron beam to the Linac Ex­ten­sion Area at the Ad­vanced Pho­ton Source at 425 MeV. In the pre­sent work, we out­line the stages of re-com­mis­sion­ing the elec­tron beam­line. We sum­marise mea­sure­ments of the elec­tron beam trans­port through the ac­cel­er­a­tor. We out­line sce­nar­ios used to ver­ify the ad­e­quacy of ra­di­a­tion shield­ing of the beam­line, and mea­sured shield­ing per­for­mance.
 
poster icon Poster WEP017 [1.140 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP017  
About • Received ※ 10 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 30 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)